Plans Side-by-Side
By default, a plansheet shows your various plans side-by-side, in lettered columns:
The demo popup (at the upper left) lets you choose what demo is the base.
Demos Side-by-Side
If you have multiple demos, you may prefer to see them side-by-side so that you can compare them.
Just click on the "Demos" button that is just above the letter column headings. The view changes to show demos side-by-side for a given plan:
You can switch from one plan to another using the little popup labeled "Plan":
If you switched to the side-by-side demos view and all of the entry cells are empty, check that popup: it may need to be set to an active plan letter.